@sarahyang108 ,
(a) is your husband / inheritor a US person ( citizen/GreenCard/Resident for Tax purposes)?
(b) Was the decedent a US person at time of passing or NRA ?
(c) Where is the house (country )?
(d) What was the approx FMV at the time of passing of the decedent? Is the property titled in your husband's name alone or shared with others? How is the property being used ( family use/ income / or ? )? Has it been disposed off or still in place ?
I am not sure why you think you need(/ed) to file a 709 or even 706 and for which year? I am assuming here that if the prop is income, you are filing the required Schedule-E or if sold you have recognized any cap gain etc. Also that if there are any bank / liquid assets involved you are filing ( if required ) FBAR and FATCA forms.
I will circle back once I hear from you -- yes ?
pk
